/Engine/Source/Runtime/GeometryCore/Public/FrameTypes.h
Compute rotation around vector that best-aligns axis of frame with target direction
void ConstrainedAlignAxis ( int AxisIndex, const [TVector](API\Runtime\Core\Math\TVector)< RealType > & ToDirection, const [TVector](API\Runtime\Core\Math\TVector)< RealType > & AroundVector )